Method of treating vulcanized rubber and of mixing same, etc.



Patented Sept. 16, 1924.

a ",i re

1,8,901 r'rsr orrra.

WILLIAM STOCKS, MIRAMAR. NEAR WELLINGTON, NEW ZEALAND.

METHOD OF TREATING VULCANIZED RUBBER AND OF MIXINGBAME, 4

No Drawing.

To all whom it may concern:

Be it known that I, WILLIAM S'rooKs, a subject of the King of Great Britain, residing at Miramar, near Wellington, in the -Dominion of New Zealand, have invented new and useful Improvements in the method of treating vulcanized rubber and of mixing same with virgin rubber for the purpose of manufacturing a new improved commercial rubber dough for the manufacture of all classes of goods where rubber is required, of which the following is a specification.

This invention is an improvement upon the invention described in the specification of phur is simultaneously driven out in the form of a vapour due to the heating of the masticating rollers the amount of the vulcanizing agent given off depending upon the time of treatment and degree of heat. In this condition the material is in a comminuted state withthe rubber and sulphur in a Y separated condition.

Y a portion of virgin rub 'When the rubber has been sufiiciently mastlcated to render it into a comminuted and plastic state, it is removed from the highly eated rollers and forms a stock rubber to be known as devulcanized rubber.

I next employ a pair of the ordinary mixng rollers known to the rubber manufacturmg trade heated and piece on these rollers r such as Part rubber or the like. The revolving action of the rollers causes the virgin rubber to be thorou hly masticated into a plastic mass.

To t is I add any required proportion of my devulcanized rubber prepared as herein previously described. By the revolving action of the heated rollers, the two rubbers are thoroughly mixed into a homogeneous mass of a p astic nature forming a stock to be known as my new and improved rubber dou h, which I then remove from the rollers.

. T is stock can be used for the manufacture of the best rubber goods of every description.

Application filed October 21, 1920. Serial No. $18,562.

I next 'take a portion of this rubber dough manufactured as herein previously described and place same again on the ordinary heated mixin rollers and add sulphur with or, without lit arge, zinc oxide and the like in mm- .cient quantities to produce vulcanization when later subjected to heat. Through the action of the rollers, the compound is thoroughly mixed through" the said rubber dough. I then remove the resulting com pound from the rollers. This is to be known as my new and improved rubber dough compounded. v v

This dough com ound can be rolled into sheets into any desired thickness or moulded into any desired goods such as motor tubes,

motor tyres, and all classes of rubber goods and vulcanized by subjecting to heat as well known to the rubber trade.'

For the manufacture of articles other than pure rubber goods, I use suitable proportions of rubber dough not compounded or comounded for vulcanization whether manuactured as herein previously described or in the ordinary way Well known to the rubber trade, together with any suitable proportion of any ground or disintegrated vegetable fibrous materials, preferably cotton such as motor tyre fabrics or the like. The rubber dough and the ground or disintegrated fibrous materials are thoroughly mixed together by the action of the revolving rollers of any ordinary mixing machine.

- It must be understood that the proportions of rubber dough and fibrous materials vary in accordance with the class of articles required to be produced.

When the rubber dough and fibrous materials are thoroughly mixed together the mixture is rolled into sheets of any requlred thickness, widths or lengths. The first rade material totake the place of leather or boot soles, being durable and impervious to water. The second grade material to be used in place of leather for bags, and portmanteaux, being strong, flexible and impervious to water, and capable of being embossed with any required design.

The third grade material to be used in place of leather for the-building up of boot eels.

The fourth grade material is to be used for floor coverin s in place of linoleums and the like. This can be manufactured in many grades.

The fifth quality material to be used for wall tiles, floor tiles, root tiles, electric switchboards and the like. These materials being vulcanized hard whilst held by an hydraulic press.

What ll do claim is:

l. A new and im roved method of treating vulcanized rubb ly in the simultaneous masticating and heating of vulcanized rubber at a temperature exceeding that at which the vulcanized rubber has previously been vulcanized b heavy revolving rollers in a heated condition, substantially as and for the purposes set forth 2. A new and improved composition of matter consisting essentially of the blending together of virgin rubber and a product produced from old vulcanized rubber by simultaneously masticating and heating the same to a temperature exceeding that at which it was vulcunized by rolling said product and the virgin rubber into a plastic mass.

or consisting essentiah.

reoenoi 3. A new and improved composition of mutter consisting of the blending together of virgin rubber and a product roduced by simultaneously masticating an heating vulcanized rubber at a tern erature exceeding that at which it was vu canized by rolling said product and the virgin rubber into a plastic mass, and then blending sulphur with or without litharge, zinc oxide and the like therewith by rolling said ingredients into a plastic mass.

l. A new article of manufacture consisting of vulcanized rubber reduced to a comminuoed state with the rubber and vulcanizing agent in a partially separated condition.

In testimony whereof ll ethx my signature in presence of two witnesses.

WILLIAM STUCKS.

. Witnesses:

i'rlnnnn S reens, J. C S'ronnann 

